49ceda6cc2
Add UnwrapConn() to the admission, proxyproto, conn limiter, metrics, and observer/stats TCP connection wrappers, complementing the traffic limiter's limitConn added in the previous commit. This makes the unwrapConn() helper in handler/sshd able to peel through any combination of these wrappers uniformly, keeping the pattern complete and future-proof for handlers that assert on concrete connection types.